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diff --git a/src/settings.h b/src/settings.h
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+/**
+ * Copyright © 2016  Mattias Andrée <maandree@member.fsf.org>
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include <time.h>
+
+
+
+/**
+ * Settings from the command line.
+ */
+struct settings {
+	/**
+	 * Print current status and exit?
+	 */
+	int print_status : 1;
+
+	/**
+	 * Start without transition?
+	 */
+	int panic_start : 1;
+
+	/**
+	 * Never transition, apart from at start?
+	 */
+	int panic_else : 1;
+
+	/**
+	 * Set temperature, possibly with transition, and exit?
+	 */
+	int set_and_exit : 1;
+
+	/**
+	 * Ignore calibrations?
+	 */
+	int ignore_calib : 1;
+
+	/**
+	 * Apply negative image filter?
+	 */
+	int negative : 1;
+
+	/**
+	 * Broadcast event with bus?
+	 */
+	int use_bus : 1;
+
+	/**
+	 * -1 to decrease temperature,
+	 * +1 to increase temperature,
+	 *  0 to set temperature.
+	 */
+	int temp_direction;
+
+	/**
+	 * The temperature, if use, the program will exit when it is done.
+	 */
+	long int temp;
+
+	/**
+	 * The temperature at full daytime.
+	 */
+	long int day_temp;
+
+	/**
+	 * The temperature at full night.
+	 */
+	long int night_temp;
+
+	/**
+	 * The temperature when disabled.
+	 */
+	long int natural_temp;
+
+	/**
+	 * Pathname to the hook script.
+	 */
+	char *hookpath;
+
+	/**
+	 * The number of seconds the transition takes.
+	 */
+	struct timespec transition;
+
+	/**
+	 * The number of kelvins per seconds the
+	 * temperature is adjusted during transition.
+	 */
+	long int trans_speed;
+
+	/**
+	 * The user's latitudinal position.
+	 */
+	double latitude;
+
+	/**
+	 * The user's longitudinal position.
+	 */
+	double longitude;
+
+	/**
+	 * The number of elements in `monitors_id` and in `monitors_arg`.
+	 */
+	size_t monitors_n;
+
+	/**
+	 * Values for -d, -e, and -m, in order.
+	 */
+	char **monitors_id;
+
+	/**
+	 * The option (the character after the dash)
+	 * the option used in correspnding element
+	 * in `monitors_id`.
+	 */
+	char *monitors_arg;
+};
+
+
+
+/**
+ * Parse the command line.
+ * 
+ * @param  argc      The number of elements in `argv`.
+ * @param  argv      The commnad line arguments including the zeroth elemenet.
+ * @param  settings  Output parameter for the settings.
+ */
+void parse_command_line(int argc, char *argv[], struct settings *settings);
+